You can show a movie on DVD at your house, say, at a party. If you're getting together to see a movie that's not out on DVD, and you pass flyers around your neighborhood or something like that, then...
If you mean "can you use the audio from a movie without permission," it depends on several factors, most notably what your use is. Using a small snippet of a movie to prove a point in an educational...
Documentaries and educational programming would be covered by 17USC110 in the US, if they are used in the course of face-to-face teaching activities. Public performance of movies for entertainment...
There is a specific exemption in US copyright law called "fair use". It allows someone to use part of a copyrighted work for purposes such as criticism, comment, news reporting, teaching (including...